Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ap%26ss..78..145d&link_type=abstract
Astrophysics and Space Science, vol. 78, no. 1, Aug. 1981, p. 145-156.
Astronomy and Astrophysics
Astrophysics
9
Astronomical Spectroscopy, Electromagnetic Absorption, Interstellar Extinction, Interstellar Matter, Abundance, Broadband, Cosmic Dust, Optical Thickness, Oxides, Silicates, Ultraviolet Spectra
Scientific paper
The production of discrete line and broad-band extinction by small interstellar oxide and silicate particles is discussed quantitatively. Restrictions on particle size and refractive index that are required to produce pure absorption features are reviewed. The relationship between optical depth in interstellar extinction and absorption coefficients for bulk materials is used to reach some general conclusions concerning the diffuse interstellar features, VUV extinction and the composition of interstellar dust. It is noted that charge transfer bands of ions such as Fe(3+) may be detectable in the VUV spectrum of dust. Several effects that lead to the enhancement of oscillator strength by 1,000 to 10,000 in small particles are discussed.
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